nervousgmat
I am not sure if you've read
MGMAT's SC but I'd recommend reviewing it even if you did. There is not much you can do in 7 days. I wouldn't recommend studying 24/7 as you'll just exhaust yourself by the test day. I dont' mean to sound harsh but it will be super hard for you to score in the 40's if your verbal in practice CATs is in upper 20's - lower 30's.
My advice would be to reschedule your GMAT at this point if getting something in 600's is not your target score. I'm not sure if you can reschedule now w/o losing $250 since you have only 7 days left before your test date.
If you decide to take the test, try to work on verbal after work when you are tired to imitate your tireness level during the test.
Good luck!
I concur with nervousgmat. To go from mid twenties to 40 on verbal in a week is very difficult. The odds are heavily stacked against you. If you are really targetting 40V then you need bit more time to study.
I did the mistake of taking GMAT a bit early and was slapped with a 34 in Verbal

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Well i dont want to bog you down, but i think you can give yourself some practical thought and set realistic expectations.